Fuel injection valve

Abstract

Provided is a fuel injection valve which can be easily processed and can realize sufficient atomization while suppressing spreading of spray. In the fuel injection valve according to the present invention, when a nozzle plate 6 and a first direction 15a-1 in which fuel is sprayed are projected onto a virtual plane perpendicular to a central axis line of the fuel injection valve along an opening and closing valve direction of a valve body and a first orthogonal coordinate system having an X1 passing through a center O1 of the nozzle plate 6 and along the first direction 15a-1 and a Y1 axis passing through the center O1 of the nozzle plate 6 and perpendicular to the X1 axis is virtualized on the virtual plane, an introduction passage 11a-1 is inclined so that a straight line segment 14a-1 connecting between a central point 40a-1 of an upstream side end portion and a center Oa-1 of an inlet opening surface of a fuel injection hole 13a-1 is positioned on the Y1 axis side with respect to a straight line 30a-1 passing through the central point 40a-1 and the center O1 of the nozzle plate 6.

The invention claimed is: 
     
       1. A fuel injection valve comprising: a valve seat; a valve body which cooperates with the valve seat to open and close a fuel passage by being displaced in an opening and closing valve direction; and a nozzle plate which is provided with a plurality of fuel injection passages constituted by a fuel injection hole and an introduction passage downstream side end portion of which is provided with the fuel injection hole, the plurality of fuel injection passages including a plurality of fuel injection passages through which fuel is sprayed toward a first direction and a plurality of fuel injection passages through which fuel is sprayed toward a second direction different from the first direction,
 wherein when the nozzle plate and the first direction are projected onto a virtual plane perpendicular to a central axis line of the fuel injection valve along the opening and closing valve direction of the valve body and a first orthogonal coordinate system having an X 1  axis passing through a center of the nozzle plate and along the first direction and a Y 1  axis passing through the center of the nozzle plate and perpendicular to the X 1  axis is virtualized on the virtual plane, 
 in the plurality of fuel injection passages, an inclined fuel injection passage is included so that a straight line segment connecting between a central point of an upstream side end portion of the introduction passage and a center of an inlet opening surface of the fuel injection hole is disposed inclined so as to be positioned on the Y 1  axis side with respect to a straight line passing through the central point and the center of the nozzle plate, and the inclined fuel injection passage is disposed in at least one of four partitions divided by the X 1  axis and the Y 1  axis of the first orthogonal coordinate system. 
 
     
     
       2. The fuel injection valve according to  claim 1 ,
 wherein the inlet opening surface of the fuel injection hole is disposed at a position at which the inlet opening surface overlaps with a central line along an upstream and downstream direction of the introduction passage on the virtual plane. 
 
     
     
       3. The fuel injection valve according to  claim 1 ,
 wherein an angle θ′ between the straight line passing through the central point and the center of the nozzle plate and a straight line segment connecting between the central point and the inlet opening surface of the fuel injection hole is 0°<θ′<90° on the virtual plane. 
 
     
     
       4. The fuel injection valve according to  claim 1 ,
 wherein the fuel injection hole of the inclined fuel injection passage is inclined with respect to the central axis line of the fuel injection valve, and 
 when, on the virtual plane, a second orthogonal coordinate system which has an X 2  axis passing through the center of the inlet opening surface of the fuel injection hole and parallel to the X 1  axis and a Y 2  axis passing through the center of the inlet opening surface of the fuel injection hole and perpendicular to the X 2  axis and in which a direction away from an original point of the first orthogonal coordinate system on the Y 2  axis is set to be 0° and an angular direction rotating from an angular position of 0° toward a side on which an absolute value of X 1  is increased in a quadrant in which a spray hole exists is set to be a positive angular direction is virtualized, 
 an inclination angle θ of a central line from the inlet opening surface of the fuel injection hole toward an outlet opening surface in the inclined fuel injection passage is 0°<θ<180° on the second orthogonal coordinate system. 
 
     
     
       5. The fuel injection valve according to  claim 1 ,
 wherein in the plurality of fuel injection passages, introduction passages of at least part of the fuel injection passages are connected at the upstream side end portion. 
 
     
     
       6. The fuel injection valve according to  claim 1 ,
 wherein in all the fuel injection passages, the straight line segment connecting between a central point of the upstream side end portion of the introduction passage and the center of the inlet opening surface of the fuel injection hole is inclined to be positioned on the Y 1  axis side with respect to the straight line passing through the central point and the center of the nozzle plate.